Suppose a wire leads into another, thinner wire of the same material which has o

Question

Suppose a wire leads into another, thinner wire of the same material which has only a fifth the cross sectional area. In the "steady state," the number of electrons per second flowing through the thick wire must be equal to the number of electrons per second flowing through the thin wire.

(a) If the drift speed 1 in the thick wire is 2e-5 m/s, what is the drift speed 2 in the thinner wire?
V2 =__________ m/s

(b) If the electric field E1 in the thick wire is 11e-3 N/C, what is the electric field E2 in the thinner wire?
E2 = _________ N/C

Explanation / Answer

A. 2e-5/(1/5) = 1e-4 B. 11e-3 / (1/5) = 0.055

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